Field Methods of Monitoring Atmospheric Systems Measuring the Size Distribution of Particulate Matter Copyright © 2006 by DBS.

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Presentation transcript:

Field Methods of Monitoring Atmospheric Systems Measuring the Size Distribution of Particulate Matter Copyright © 2006 by DBS

Introduction Diameter (μm) Commonly used term < 0.1fume smoke dust > 100grit

Sources e.g NH 4 Cl, SO 4 2- / NO 3 - salts Natural: forest fires, volcanoes etc. Man-made: fossil-fuel combustion, industry Mineral dust from weathering of rocks and soils Chemical composition can be used to ID source and fate

Particle Size Distribution Source: Keywood, M Fly ash Coal dust Sand

Particle Size Distribution Classify via Aerodynamic diameter (> 1.0 μm) –Use multistage impactor Electrical mobility ( μm) –Electrical field strength is increased to remove progressively larger particles –Aerodynamic Particle Sizer Light-scattering properties –Intensity of scattered light is proportional to particle size Boubel et al,

Further Reading Journal articles

Text Books Hesketh, H.D. (1994) Air and Waste Management: A Laboratory/Field Handbook. CRC Press, Florida. Lodge, J.P.A. ed. (1988) Methods of Air Sampling and Analysis, 3rd Edition. CRC Press, Florida. Wight, G.D. (1994) Fundamentals of Air Sampling. CRC Press, Florida. Winegar, E.D. and Keith, L.A. eds. (1993) Sampling and Analysis of Airborne Pollutants. CRC Press, Florida.